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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6b3d7caa59da80be92f35b12d9cdfa852416c594d326e48eb740a711f7e7377' 
  AND token = '3gFcudtKyl2JCU/iUPhcrQ4di6YSJ6oliAIJLmHzmpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}